Senior Fullstack Mobile Product Engineer

Plasma is a purpose-built blockchain for stablecoin payments. Engineered from the ground up to address the unique needs of stablecoins, Plasma provides a scalable, efficient, and secure foundation for the next generation of money movement. We believe stablecoins can transform global finance and improve financial access worldwide. To reach the next level of adoption, dedicated and purpose-built infrastructure is required. The Role We are looking for a Senior Fullstack Mobile Product Engineer to join our founding product team and build consumer-facing mobile applications that make stablecoin transfers feel seamless and familiar. This role is primarily focused on mobile and frontend development, with secondary responsibilities in backend services and blockchain integration as needed. You will contribute across the stack to deliver polished, user-friendly features, with a focus on product engineering rather than protocol development. What You Will Do Design and develop mobile applications using React Native and Expo, with a focus on performance, responsiveness, and motion design Build responsive web applications and reusable UI components for stablecoin wallets, transaction flows, and financial interactions Ensure consistency and quality across iOS and Android platforms through testing, polish, and design collaboration Develop and maintain mobile-first design systems in close partnership with product and design teams Integrate mobile apps with backend services and blockchain infrastructure to enable secure wallet functionality and real‑time updates Build APIs for mobile clients and implement transaction signing, balance updates, and error recovery logic Drive product quality through testing strategies, continuous delivery practices, and attention to UX detail Who You Are 5+ years of experience in fullstack and mobile development, with deep expertise in React Native and modern JavaScript frameworks Proficient in TypeScript, with strong experience using Expo and deploying mobile apps to iOS and Android platforms Skilled in state management tools such as Redux, MobX, or Zustand, with a focus on clean architecture and scalability Strong eye for design, with a track record of delivering polished, intuitive mobile user experiences Comfortable working across the stack, with backend experience in Node.js and API integration (REST and GraphQL) Experience building real-time features using WebSocket or similar technologies Experience with mobile wallet security, such as biometric authentication, and secure key storage Understanding of mobile-specific blockchain challenges, such as WalletConnect integration and deep linking Experience optimizing React Native apps for performance A high degree of ownership and product intuition, with a focus on quality, performance, and reliability Our Stack Mobile: React Native, Expo, TypeScript, Reanimated Frontend: React, Next.js, TypeScript, TailwindCSS State Management: Zustand, TanStack Query Backend: Node.js, TypeScript, PostgreSQL, Redis Blockchain: Ethers.js, WalletConnect, Web3 providers Infrastructure: Vercel, Docker, Kubernetes, AWS/GCP Tools: GitHub, CI/CD pipelines, Sentry, Analytics Team Culture At Plasma, you’ll be joining a team that’s redefining how the world interacts with money. We’re building the best team in the world—people who are relentless about their craft and expect the same from you. This is not the place for half measures; it’s where you’ll do the hardest, most meaningful work of your career alongside those who demand excellence of themselves and everyone around them. We work with trust, clarity, and ambition. Everyone owns their craft and contributes beyond it, moving fast and backing each other to deliver. Our culture is built for those who thrive on challenge and want to leave a mark—because here, good isn’t good enough. Salary and Benefits At Plasma, we provide each team member with the tools they need to succeed. Benefits for full‑time employees include : An above‑market salary with token compensation Comprehensive insurance coverage with premiums for you and your family covered by Plasma Monthly wellness stipends Visa sponsorships and re‑location benefits Offices located in the heart of London, including access to a gym/sauna and daily lunches Data Protection & Privacy We are committed to protecting the privacy and security of your personal data. Any personal information you provide during the recruitment process will be processed in accordance with the General Data Protection Regulation (GDPR) and applicable local data protection laws. Your data will be used solely for the purposes of assessing your suitability for the role and managing the recruitment process. It may be shared with internal stakeholders, but it will not be disclosed to third parties for unrelated purposes. If your application is unsuccessful, we will retain your data only for as long as necessary in accordance with our retention policy, after which it will be securely deleted. You have the right to request access, correction, or deletion of your data, as well as to withdraw your consent for processing. For additional details, please review our #J-18808-Ljbffr